/**
 *    Copyright 2009-2020 the original author or authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package org.apache.ibatis.aapl.script.creator;

import org.apache.ibatis.aapl.annotation.TableWatcher;
import org.apache.ibatis.aapl.util.Clause;
import org.apache.ibatis.aapl.util.ClauseUtil;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.LinkedList;
import java.util.List;

public class InsertSqlCreator implements SqlCreator {
  @Override
  public String createSql(String script, Method method, TableWatcher watcher) {
    if (method.getParameterTypes().length < 1) {
      return script;
    }
    Class<?> paramType = method.getParameterTypes()[0];
    Field[] declaredFields = paramType.getDeclaredFields();
    List<String> fields = new LinkedList<>();

    Clause clause = ClauseUtil.parse(script);
    List<String> excepts = clause.except();

    for (Field e : declaredFields) {
      if (Modifier.isStatic(e.getModifiers())) {
        continue;
      }
      String name = e.getName();
      if (excepts.contains(name)) {
        continue;
      }
      fields.add(name);
    }
    StringBuilder key = new StringBuilder();
    StringBuilder value = new StringBuilder();
    while (fields.size() > 0) {
      String s = fields.get(0);
      key.append(s);
      value.append("#{");
      value.append(s);
      value.append("}");
      if (fields.size() != 1) {
        key.append(",");
        value.append(",");
      }
      fields.remove(0);
    }
    StringBuilder builder = new StringBuilder();
    builder.append("insert into ");
    builder.append(watcher.value());
    builder.append("(");
    builder.append(key);
    builder.append(") values(");
    builder.append(value);
    builder.append(")");
    return builder.toString();
  }
}
